sysdeps/m68k/m680x0/fpu/fraiseexcpt.c

   1 /* Raise given exceptions.
   2    Copyright (C) 1997-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <float.h>
  22 #include <math.h>
  23
  24 int
  25 __feraiseexcept (int excepts)
  26 {
  27   /* Raise exceptions represented by EXCEPTS.  But we must raise only one
  28      signal at a time.  It is important that if the overflow/underflow
  29      exception and the divide by zero exception are given at the same
  30      time, the overflow/underflow exception follows the divide by zero
  31      exception.  */
  32
  33   /* First: invalid exception.  */
  34   if (excepts & FE_INVALID)
  35     {
  36       /* One example of an invalid operation is 0 * Infinity.  */
  37       double d = HUGE_VAL;
  38       __asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d));
  39     }
  40
  41   /* Next: division by zero.  */
  42   if (excepts & FE_DIVBYZERO)
  43     {
  44       double d = 1.0;
  45       __asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d));
  46     }
  47
  48   /* Next: overflow.  */
  49   if (excepts & FE_OVERFLOW)
  50     {
  51       long double d = LDBL_MAX;
  52
  53       __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d));
  54     }
  55
  56   /* Next: underflow.  */
  57   if (excepts & FE_UNDERFLOW)
  58     {
  59       long double d = -LDBL_MAX;
  60
  61       __asm__ __volatile__ ("fetox%.x %0; fnop" : "=f" (d) : "0" (d));
  62     }
  63
  64   /* Last: inexact.  */
  65   if (excepts & FE_INEXACT)
  66     {
  67       long double d = 1.0;
  68       __asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d));
  69     }
  70
  71   /* Success.  */
  72   return 0;
  73 }
  74
  75 #include <shlib-compat.h>
  76 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  77 strong_alias (__feraiseexcept, __old_feraiseexcept)
  78 compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
  79 #endif
  80
  81 libm_hidden_def (__feraiseexcept)
  82 libm_hidden_ver (__feraiseexcept, feraiseexcept)
  83 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);